Abstract
In this paper, various locations of an Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag on automotive license plates have been considered based on the radiation pattern of the tag antenna. A small, 130 × 50 mm, passive loop antenna type UHF RFID tag for an automotive license plate was simulated with an EM simulation CST program. It was designed to have a larger back-lobe radiation pattern since the front side of the tag faces the back side of the plate holder to protect the tag antenna from bugs and dust when the automobile runs. The tag was attached to the side of a license plate holder with a dimension of 520 × 110 mm, the typical size of the standard license plate. The reflection coefficient of the tag antenna is −21 dB at 920 MHz, and the gain of the tag antenna is 6.29 dBi at the back-lobe. The reading range of the tag antenna with the plate holder, which was measured in an open field, is about 10.3 m, and the reading range of the tag installed on the bumper from the front of the vehicle is 9.4 m. The tag antenna is small enough to apply to a real automobile, and it is applicable because it uses the back-lobe pattern, so it does not require an extra device for protection from damage.
Highlights
Information and Communication Engineering Department, Daegu University, Kyungsan 38453, Korea; Abstract: In this paper, various locations of an Ultra High Frequency (UHF) Radio Frequency
125~135 kHz and High Frequency (HF) 13.56 MHz bands are used for short-distance use, and the active Ultra High Frequency (UHF) 433 MHz system is used for long-distance applications such as container management
The UHF Radio Frequency Identification (RFID) band, 860~960 MHz, is generally used for logistics management, and the 2.45 GHz band is used for check authentication and passport recognition
Summary
Radio Frequency Identification (RFID) is used for the recognition of objects or people. In order to improve the identification accuracy, a dual resonant frequency diversity design was conducted in article [21] This license plate tag antenna has the dual resonant frequency of an active band (433 MHz) and a passive UHF RFID band to reduce identification error. A very small UHF RFID band tag antenna, the size of an American quarter coin, was designed and applied to the rear plate license plate fixing seal-bolt and implemented a system to recognize illegal vehicles. A small size passive UHF RFID tag antenna, 130 × 50 mm, for the license plate was designed, which faces the bumper rather than the front. The reading range is calculated with Equation (3) [3,26]
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